Valve grinder



Pafnted Dec.'5,1922.

Patented Use. 5, 1922.

rarer entice.

RALPH BROWN GOODBICH, OF CINCINNATI, OHIO.

VALVE GRINDER.

Application filed April 23,

1 0 (ZZZ whom it may concern: 7

Be it known that I, RALPH l-lnown Goonmen, a citizen of the United States, and a resident of the city of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Valve Grinders, of which the following is a full, clear, and exact description, reference being had to the drawings forming a part of this specification.

My invention relates to valve grinding. machines wherein a. continuous rotary motion is converted into a reciprocatory rotary motion, as applied to grinding shaft.

l/Vhile in the drawings I have illustrated one type of machine embodying my invention, having a hand crank, and but a single grinding shaft it should not be understood that my invention is to be limited to the specific form shown. or any specific form of construction, so far as casing method of operation and size is concerned.

Among the objects of my invention are the provision of a mechanism wherein a re ciprocatory motion is applied to a shaft. together with a step by step advance and wherein all motions are positive and smooth. I provide against all possibility of an improper meshing of the mutilated gear structure, which gives me the reciprocation and advance, and do this in a simple and effective manner, whereby the motion applied to the grinding shaft shifts from clockwise to counterclockwise without jerks and strains.

More specifically I provide means whereby two mutilated gears, one having more teeth than the other, are alternately brought into mesh with a spur gear, by means of a set of guards that hold the teeth of one mutilated gear in mesh until the exact point for ent'ance of the first tooth of the other gear, and in which the, entrance into and out of mesh are under spring control. Generally stated I thereby retain the mesh of each mutilated gear with the spur gear until a predetermined, instant when the one gear springs out of mesh and the other into mesh.

I further provide a convenient means of utilizing the specific mechanism shown for hand operation or power operation and a novel means for securing an extension shaft on mygrinding shaft, where desired.

These objects and other advantages to be noted. I accomplish by that certain construe tion and arrangement of parts to be herein- 1920. Serial No. 375,928.

after more specifically pointed out and claimed.

In the drawings,

Figure l is a side elevation of my machine with the casing partly broken away.

Figure 2 is a central longitudinal section of my device taken at right angles to Figure l.

lf1gure 3 is a plan view of the base of the caslng or my device showing the crown spur gear, and the guiding devices.

Figure l: is a detail perspective of the device for mounting an additional shaft on the grinding shaft, for work requiring long reach.

The casing of the mechanism forms no essential part of my invention.

.is shown it comprises a shell 1, with a removable side vall 2, this side wall held in place by means of tongues 8, and screws 4 mounted in the periphery of the main body of the shell. The drive shaft 5, which is to be continuously revolved in one direction, seats at its inner end in the one side of the shell and extends out through the removable wall at the other end, where it mav be fitted with an operating handle 6. p

At the center of the shaft is a spacing portion or drum 7, -.1eends of which are slightly rounded. The portions of the shaft abutting on the ends of the spacing member are squared. as at 8, and serve as the mounting for the mutilated gears. which have squared holes in their center. I

There are two gears 9 and 10 which are preferably spur gears and arranged so that the toothed portions of one gear, when mounted, terminates a certain spaced distance before the toothed portions of the other gear begin. This space is equal to the distance through which one terminal tooth of either gear moves while in mesh with the grinding shaft gear.

The grinding shaft gear or horizontal gear 11, is likewise a spur gear and is mounted within the casing on the end of the grinding shaft 12. This gear bears against the end of the journal sleeve 15 and may or may not have some antifriction bearing at this point, as desired, none being shown for purpose of simplifying the illustration.

The ournal sleeve 15 is mounted over the shaft exterior of the casing and is suitably threaded at 16 to screw into the casing. A space is available above the platc ld for mounting a nut l5 on the threaded end of the sleeve. A stop collar 15 holds the shaft so that it has substantially no play in a longitudinal direction.

The shaft is preferably smtted and perforated at its end at 17 so as to detachably receive a tool that will engage the special form of valve required for imparting grindmotion thereto. It is also arranged so as to receive additional fittings, for lengthening the shaft so as to be adapted for special cases requiring a long reach.

Thus the grinding shaft has formed thereon asmall lug 18 and the additional shaft 19, whatever be its nature, is provided with a socket 20 to lit over the end of the shaft and with a bayonet slot 21, which is suitably formed to slide up over the lug and then turn laterally over it. thereby forming the usual bayonet lock.

1 provide, however, an additional feature which gives special value to the form of attaclnnent, in the form of a spring 22, which is mounted so as to extend lengthwise over the longitudinal portion of the slot, and is bent inwardly so as to normally engage in the slot, opposite the right angle turn therein. Its free end is then bent upwardly as at for providing a finger ens rement.

As so constructed, the spring will ride up over the lug when the attachment is being mounted and when it is turned into locking position will snap down into the slot, thereby locking the lug in the lateral branch of the slot. For removal of the attachment, it will be necessary to lift up the spring, whereupon the operator may readily turn off the said attachment.

The value of this device in connection with the grinder shaft is obvious when it is considered that this shaft is oscillated rapidly to and fro during the operation of the machine.

The mechanism for controlling the mesh of the mutilated gears with the spur gear comprises essentially the plate lei. which cooperates with the terminal teeth on each mutilated gear. These terminal teeth are made of greater length than the remaining teeth, as at 9 and 9" for the entering and leaving teeth of gear 9. and as at 10' and 10 for the entering and leaving teeth of the gear 10.

On the plate 14 are two sets of ribs, which ext nd upwardly and act on the longer teeth only. There are the ribs 24: on each side of the spur gear, which extend alongside of said gear. There are also the ribs 25, which are located at the entrant point of the gear teeth into mesh with the spur gear, and

are spaced inwardly from the outer ribs The mutilated gears are formed, as has been stated with square holes therein to lit over the squared portions of the drive shaft, The holes in the gears, however, are made larger by a small fraction than the shaft portions, and both of the edges of the holes are rounded as at 26, so as to rock easily against the curved ends of the spacing member on the said drive shaft, and tilt readily on the squared portion thereof.

Set over the drive shaft are some suitable form of springs which bear on the walls of the casing and against the said mutilated gears. its a convenient form. I provide the spring plates 27, which have a suitable aperture for mounting them over the shaft, and have their ends bowed inwardly of the easing. Pins 28 are formed on the ends of these spring plates, which pins enter suitable holes sunk in the outer faces of the gears, said holes being positioned so as to bring the ends of the spring plates as near as possible adjacent the long terminal teeth on each gear. This positioning of the plates imparts the greatest spring action against the gears at the proper point, as will be noted.

Due to the above structure the gears are permitted to rock slightly on the drive shaft. but are normally held at right angles thereto by means of the spring plates.

As shown in dotted lines in Figure 3 the long tooth of one as it is about to enter into mesh. rides up on its rib which rib is turned at a slight angle outwardly of the normal path of the gear. At the same instant. the terminal tooth 10" of the other gear will have reached a point where it is about to become freed from behind the rib 24.

The ribs 24 are cut down at the middle in order to permit the teeth of the spur gear to ride over them but the long teeth cannot move out laterally from mesh with the spur gear in view of the intervention of the ribs A very slight fraction of a turn from the position in Figure 3 will permit the long tooth fl to snap into mesh vith the crown gear. and the long tooth 10 to snap out from mesh and slide off the slightly curved end of the side rib v This same situation will take place when the tooth 10 is about to come into mesh and the tooth 9 to snap out of mesh. The spur gear is always positioned exactlv right for the entrance into mesh of the entering tooth of each gear and the instant of mesh coincides with the instant of release by the companion gear. The spring pressure exerted by the spring plates that tend to hold the mutilated gears from rocking on their shaft. will permit the laterally tipping or rocking motion of the gears but will act instantly to correct their position to the perpendicular, as soon as strain is relieved.

lf it were not for the side ribs. the ill";- parting' of a sudden strain to the grinding shaft. such as an extra pressure by the op erator or the like, would result in the gear,

that happens to be in mesh, snapping out laterally before the spur gear was in proper position for receiving the subsequent meshing of the other gear.

i do not rely upon any reaction between the mutilated gears and the spur gear, but instead rely upon a certain and positive controlling'means, which acts on the mutilated gears alone, thereby obtaining a mechanism which according to my experime will, not fail of absolutely smooth action at a very high R. P. figure.

lhe casing is. shown as provided with a handle 30, for use in holding the device for hand manipulation, and it is also provided with wing plates 81, suitably slotted at 32, whereby the device may be installed in a drill press, mounted in connection with an electric operating device, or the like.

It is not desired that my claims that follow be limited by reason of the fact that the above description does not touch upon the various mechanical equivalents for the parts described. The drawing and description were selected. by me purely for the purpose of illustrating one preferred form. of my mechanism and as demonstrative of the principles involved in my invention, that will be set forth in the appended claims.

riaving thus described my invention,

. what I claim as new and desire to secure by Letters Patent is 1. A valve grinder adapted to impart reciprocal advancing movement to a grinding shaft, comprising in part a gear fast on the shaft and by which it is rocked, a pair of mutilated gears to mesh therewith on opposing sides thereof, said mutilated gears having mounting means adapted to permit of a lateral tilting movement thereof with rela-- tion to their axes, and spring means for resiliently retaining said mutilated gears in right angle relation to the grinding shaft gear and means for driving the mutilated gears.

2. A valve grinder adapted to impart re" ciprocal advancing movement to a grinding shaft comprising in part a gear fast on the shaft and by which it is rocked, a pair of mutilated gears to mesh therewith, means for mounting said mutilated gears to permit of a resilient movement thereof, anda controlling element to enforce a lateral movement of the gears, or one of them at least, at the inception of the mesh of its teeth. with the grinding shaft gear to enforce a full mesh therewith but arranged to free same from enforced movement at all other times.

3. A. valve grinder adapted to impart reciprocal advancing movement to a grinding shaft comprising in part a gear on the shaft, :1 pair of mutilated gears to mesh therewith, means for mounting said mutilated gears to permit of a resilient movement thereof, and

a controlling element to enforce a resilient movement of the gears, or one of them at least, at the inception of the mesh of its teeth with the grinding shaft gear, and additional means to prevent a resilient movement of gears or one of them at least, while in mesh with such grinding shaft gear.

4. A valve grinder for imparting a re ciprocal advancing movement of a grinding shaft comprising in part, a grinding shaft, a casing, a gear fast on the grinding shaft within the casing. and by which the shaft is rocked, a drive shaft within the casing, a pair of mutilated gears on said drive shaft arranged vertically to the grinding shaft gear, said mutilated gears having a loose it so as to permit a tilting thereof on the shaft and said gears having a rounded facial contact with said shaft, for the purpose de-. scribed.

5. A valve grinder for imparting a re procal advancing movement to a grinding shaft comprising in part a grinding shaft a casing, a gear on the grinding shaft within the casing, a drive shaft therein, a pair of mutilate gears on the drive shaft arranged vertically to the grinding shaft gear, said gears being mounted so as to rock but not rotate with relation to the drive shaft, and. springs to maintain them in position vertik cal to the grinding shaft gear. i

6. A valve grinder for imparting a re ciprocal advancing movement to a grinding shaft comprising in part a grinding shaft a casing, a gear on the grinding shaft within the casing, a drive shaft therein, a pair of mutilated gears on the drive shaft arranged vertcially to the grinding shaft gear, said gears being mounted so as to rock but not rotate with relation to the drive shaft, and springs to maintain them in position vertical to the grinding shaft gear. sa d springs comprising leaf springs bearing against the faces of the gears, and means for retaining the springs in a position spanning the toothed aortions of said mutilated gears. as

distinguished from bisecting said gears at the toothed portions.

7. A valve grinder for imparting a reciprocal advancing movement to a grinding shaft comprising in part a grinding shaft a casing, gear on the grinding shaft within the casing, a drive shaft therein, a pair of mutilated gears on the drive shaft arranged vertically to the grinding shaft gear, said gears being mounted so as to rock but not rotate with relation to the drive shaft, and springs to maintain them in position vertical to the grinding shaft gear, said springs comprising leaf springs bearing against the faces of the gears at their ends, and against a casing supported part at their centers.

8. A valve grinder for imparting a reciprocal advancing movement to a grinding shaft comprising in part a grinding shaft ed over a drive sh- Lib ' drive shaft,

a casing, a gear on the grinding shaft within the casing, a drive shaft therein, a pair of mutilated gears on the drive shaft arranged vertically to the grinding shaft gear, said gears being mounted so as to rock but not r tate with relation to the drive shaft, and springs to maintain them in position vertical to the grinding shaft gear, said springs comprising leaf springs mounted over the and a pin and S clret connection between the ends of the springs and the faces of the said gears.

9. A spring device in a structure of the character described, comprising in combination with mutil ted gear rochingly mountft, a spring plate moan over the shaft at its center, and a pin and slot connection between the ends of the spring and the gear,

10. A mutilated gear supporting and operatin device in a structure of the character described comprising a drive shaft, a spacing drum element thereon said drum element having rounded ends, a squaredportion or portions adjacent said rounded ends, and a mutilated gear or gears mounted on said squared portion, said gear or gears having a squared hole for engaging tiltingly on the squared portion, and a rounded inner edge for said hole to roclzonthe rounded drum end.

11. A valve grinder comprising in part a grinding shaft gear fast on its shaft, a pair of mutilated gears, means for driving said gears to mesh in rotation, one on one side and one on tne other of the grinding shaft gear, and means for imparting a lateral resilient movement to said mutilated gears with relation to their axes and controlling such movement whereby the entrant tooth of one gear snaps into mesh with said driving shaft gear at the in tant that the terminal tooth ofthe other snaps out of mesh.

12. A valve grinder comprising in part a grinding shaft gear, a pair of mutilated gears, means for driving said gears to mesh iii rotation, one on one side and one on the other of the grinding shaft gear. and means for imparting lateral resilient movement to said mutilated gears and controlling c h movement whereby the entrant tooth of one gear snaps into mesh with said driving shaft gear at the instant that the terminal tooth of the gear snaps out of mesh, said means commenses prising guard element located alongside of the grinding shaft gear to prevent lateral movement out of mesh of either gear until a designated instant, and additional guard element to enforce a non-tangential entrance of either gear into mesh with said grind ing shaft gear.

13. A valve grinder comprising in part a grinding shaft gear, a drive shaft, mutilzved gears on the drive shaft to alternately mesh on opposing sides of the grinding shaft gear, means for providing resilient movement of the mutilated gears on the drive shaft, said gears having the terminal tooth at each end of the toothed portions thereof of greater length than the remaining teeth, and means for acting on said longer teeth to enforce positive meshing of the said mutilated gears with the grinding shaft gear, I

14. A valve grinder comprising in part a grinding shaft gear, a drive shaft, mutilated gears on the drive shaft to alternately mesh on opposing sides of the grinding shaft'gear, means for providing resilient movement of the mutilated gears on the drive shaft, said gears having the terminal tooth at each end of the toothed portion thereof of greater length than the remaining teeth, and means for acting on said longer teeth to enforce positive meshing of the said mutilated gears with the grinding shaft gear, said means comprisingtwo sets of ribs or the like, one set to elevate and drop the entering long teeth non-tangentially into a space between two teeth of the grinding shaft gear, and another set located along the sides of the grinding shaft gear, and adapted to engage the sides of the other terminal teeth and prevent them from snapping out of mesh laterally until the grinding shaft gear is positioned to properly receive the entering teeth of the opposed gears.

15. In a valve grinder, a grinding shaft means for imparting reciprocal rotary movement thereto, and a fitting for said shaft one of said two members having a lug, and the other a bayonet slot, and a spring on the member having the slot, said spring having a portion resiliently pressed into the slot adjacent the angle bend therein, and a sloping end to ride up on the said lug, on the other member, and for the purpose described.

RALPH BROWN GOODRICH. 

